The upper number is '98'.
What is the lower number?
The pipes are displaying the numbers as they are.
The two digits are connected vertically.
If you look at the upper number, you can see that the top half of it is a '9'.
The pipes are joined so that they show two digits, one on top of the other.
In the upper pipe, you should be able to see the '9' and '8' joined together.
The answer is '86'.